<template>
  <view>
    <view class="search-box">
      <uni-search-bar focus="true" @input="input" :radius="100" cancelButton='none' ></uni-search-bar>
    </view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length">
      <view @click="gotoDetail(item)" class="sugg-item" v-for="(item, index) in searchResults" :key="index">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag @click="gotoGoodsList(item)" :text="item" v-for="(item,index) in historys" :key="index"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '' ,// 搜索关键词
        searchResults: [] ,// 搜索建议结果列表
        historyList: ['a', 'app', 'apple']
      }
    },
    onLoad(){
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]') 
    },
    methods: {
      // 表单的 输入事件
      input(e){
        // console.log(e)
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          // console.log(e)
          this.kw = e
          this.getSearchList()
        }, 500)
      },
      async getSearchList(){
        if(!this.kw){
          this.searchResults = []
          return
        }
        const {data:res} = await uni.$http.get('/goods/qsearch', { query: this.kw })
        // console.log(res)
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        
        // 调用存储历史搜索
        this.saveSearchHistory()
      },
      gotoDetail(item){
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id,
        });
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        
        // 将 Array 数组转化成 Set 对象
        const set = new Set(this.historyList)
        // 调用 Set 对象的 delete 方法，移除对应的元素
        set.delete(this.kw)
        // 调用 Set 对象的 add 方法，向 Set 中添加元素
        set.add(this.kw)
        // 将 Set 对象转化为 Array 对象
        this.historyList = Array.from(set)
        
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      cleanHistory(){
        this.historyList = []
        uni.setStorageSync('kw', '[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed:{
      historys(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 1;
}

.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    // 挤出文字的高度
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      // 文字不允许换行
      white-space: nowrap;
      // 文字超出隐藏
      overflow: hidden;
      // 超出部分使用 ... 显示
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}

.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    height: 40px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
      margin-top: 5px;
     
    .uni-tag{
      background-color: #efefef;
      color: #000000;
      border: none;
      margin-right: 5px;
    }
  }
}
</style>
